A multifunctional mouse model to study the role of Samd3

Area of Science:

• Immunology
• Cellular Immunology
• Viral Immunology

Background:

• Immunological memory is crucial for adaptive immunity.
• Samd3's role in cellular immune responses and memory development is not well understood.
• NK cells and CD8 T cells are key players in fighting viral infections.

Purpose of the Study:

• To investigate the function of Samd3 in cellular immune responses and immunological memory development.
• To characterize Samd3 expression patterns in immune cells during viral infections.
• To generate a novel mouse model for studying Samd3 and its expressing cells.

Main Methods:

• Generation of a conditional Samd3 knock-out mouse model with fluorescent reporter and diphtheria toxin receptor (huDTR) cassette.
• Analysis of Samd3 expression in NK cells and CD8 T cells during acute and chronic viral infections.
• Assessment of CD8 T cell function in Samd3-deficient mice following Vaccinia virus and Lymphocytic choriomeningitis virus infections.

Main Results:

• Samd3 expression was detected in NK cells and CD8 T cells, particularly in memory precursor and precursor exhausted CD8 T cells during viral infections.
• The frequency of Samd3-expressing cells increased during the memory phase of acute viral infections.
• Samd3-deficient CD8 T cells showed no functional impairment in acute or chronic viral infection models.

Conclusions:

• A novel mouse model was developed to study Samd3 and Samd3-expressing cells.
• Samd3 is specifically expressed in NK cells, memory CD8 T cells, and precursor exhausted T cells during viral infections.
• The precise molecular function of Samd3 in these cells remains to be elucidated.